Propeller



H. -LBACE PROPBLLER No. 10,474. Patented Jan. 31, 1854.4y

UNITED STATES PATENT OFFICE,

HARRY LEAOH, OF BOSTON, MASSAOHUSETTS.

PROPELLER.

speciecation of Letters Patent No. 10,474, dated January e1, 1854.

To all whom may concern:

Be it known that I, HARRY LEAoH, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and use-` ful Improvements in Propellers for Navigable Vessels; and I do hereby declare that the same is fully described and represented in the following specication and the ac companying drawings, letters, figures, and references thereof.

Of the said drawings Figure 1 denotes an end elevation and Fig. 2 a side view of one of my improved propellers.

Inl the said drawings A denotes the huh of the propeller having three arms B, B, B, projected from it.

Instead of applying to each of these arms a wing composed of a single float in the usual way I make the wings in two parts or floats C, D, andso arrange them that there shall be an opening or passage between them and that they shall extend or project in opposite directions, and that'one of them or the greater part of it when the propeller is put in revolution shall move in a path separate or distinct from that of the greater part of the other. Byl such a construction of the propeller it is found in principle thatv a large portion of the hack water that usually obstruct-s the action of the wing will pass between the two floats O, D, and escape through the passage E whereby the wheel will be to a very great degree relie-ved from the retarding effects of theback water. One or more stays F is placed between the two oats or made to extend from one to th-eV other for the purpose of steadying them or Causing them to mutually support one another, while the propeller is in I claim- The above specied improvement in constructing apropeller, viz,.of a combination with each of its arms B, B, B, of two parts or floats C, D, (projected in opposite direcaction. n

tions) and an opening or passage'E arranged t between them for the escape of back water,

the whole being substantially as yabove described.

In testimony whereof I havehereto set my FRANCIS GoULD. 

